 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.editors.text;

 import org.eclipse.core.filebuffers.ISynchronizationContext;

 import org.eclipse.swt.widgets.Display;

 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchWindow;
 import org.eclipse.ui.PlatformUI;

 /**
  * Synchronization context for file buffers whose documents are shown in the UI.
  * The synchronization runnable is executed in the UI thread.
  *
  * @since 3.0
  */
 public class UISynchronizationContext implements ISynchronizationContext {

     /*
      * @see org.eclipse.core.filebuffers.ISynchronizationContext#run(java.lang.Runnable)
      */
     public void run(Runnable runnable) {
         if (Display.getCurrent() != null) {
             runnable.run();
         } else {
             IWorkbench workbench= PlatformUI.getWorkbench();
             IWorkbenchWindow[] windows= workbench.getWorkbenchWindows();
             if (windows != null && windows.length > 0) {
                 Display display= windows[0].getShell().getDisplay();
                 display.asyncExec(runnable);
             } else {
                 runnable.run();
             }
         }
     }
 }

